EP1396123B1 - Procede de transport de paquets a longueur variable dans des trames de circuits temporels - Google Patents

Procede de transport de paquets a longueur variable dans des trames de circuits temporels Download PDF

Info

Publication number
EP1396123B1
EP1396123B1 EP02747502A EP02747502A EP1396123B1 EP 1396123 B1 EP1396123 B1 EP 1396123B1 EP 02747502 A EP02747502 A EP 02747502A EP 02747502 A EP02747502 A EP 02747502A EP 1396123 B1 EP1396123 B1 EP 1396123B1
Authority
EP
European Patent Office
Prior art keywords
time slots
packet
frame
packets
transport
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02747502A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1396123A1 (fr
Inventor
Jean.Paul Quinquis
Jean-Yves Cochennec
Olivier Roussel
Thierry Houdoin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Orange SA
Original Assignee
France Telecom SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by France Telecom SA filed Critical France Telecom SA
Publication of EP1396123A1 publication Critical patent/EP1396123A1/fr
Application granted granted Critical
Publication of EP1396123B1 publication Critical patent/EP1396123B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5672—Multiplexing, e.g. coding, scrambling

Definitions

  • variable-length packets are packets that are compliant with ITU-A AAL2 (ITU Recommendation 1363.2), while time-domain frames are, for example, of the type defined in Recommendation G.703 and ITU-T Rec. G.704 of the IUT and which are generally called E1 or T1 frames or else of the type that is also called SDSL or HDSL.
  • ITU-A AAL2 ITU Recommendation 1363.2
  • time-domain frames are, for example, of the type defined in Recommendation G.703 and ITU-T Rec. G.704 of the IUT and which are generally called E1 or T1 frames or else of the type that is also called SDSL or HDSL.
  • the transport of AAL2 compliant information (ITU Recommendations I.363.2, I366.1 and 1366.2) and the implementation of related signaling (ITU Recommendation Q.2630.2) is recommended or considered in different communication networks of which the best known is at present the network for mobile access 3rd generation called UTRAN (UMTS Terrestrial Radio access network).
  • UTRAN UMTS Terrestrial Radio access network
  • the use of this AAL2 protocol on a network access type ATM cells has been definitively adopted by the 3GPP standardization body for the 1999 version (R99) of the UTRAN, this version being called today R3.
  • the present invention therefore finds application in the RNC mobile network controller architectures and in the so-called node B base stations of a UTRAN access network.
  • the field of application of the present invention is moreover located at the periphery of the networks when the accesses make use of existing circuits-type connections. This is especially considered today to connect Node B base stations to hubs or controllers of RNC mobile networks in certain network configurations, especially in rural areas.
  • AAL2 transport protocol The principles governing the so-called AAL2 transport protocol described in the three recommendations of IUT 1363.2, I366.1 and I366.2 are described below.
  • This transport protocol has been defined to circumvent the problem of assembly time of an ATM cell that becomes critical for low bit rates. Indeed, at 16 kbit / s, this assembly time is 24 ms for a complete filling of the ATM cell.
  • the solution that has been adopted consists of multiplexing the flows of several communications in the same ATM channel by using a structuring of the information in packets, called minicells or also CPS packets.
  • This mode of transport is the lowest part of the protocol named Common Part Sublayer (CPS).
  • CPS Common Part Sublayer
  • the essential adaptation functions are located above the CPS sublayer in sublayers named Service Specific Convergence Sublayer (SSCS).
  • SSCS Service Specific Convergence Sublayer
  • the first, the SSCS segmentation sublayer, is described in ITU Recommendation 1.366.1 and is intended for the transport of data units with a large number of bytes.
  • the second, the real-time trunk SSCS, is described in ITU Recommendation 1.366.2.
  • An AAL2 packet sequence is guaranteed on each AAL2 channel, but the service provided by the CPS sublayer is of uninsured type, that is, the missing packets (for example due to ATM cell losses). transporting them) are not replaced by retransmission at this level.
  • AAL2 packets are typically transmitted carried by ATM cells.
  • a frame of time circuits such as that which is the subject of the recommendation G.704 is divided into 32 IT intervals each occupied by a byte. It is considered here that the only intervals 1 to 15 and 17 to 31 carry user data.
  • a frame has a duration of 125 ⁇ s and the data rate carried by each IT interval is limited to 64 kb / s.
  • the time intervals IT it is possible to dispose the information at a rate of N times 64 kb / s, that is to say 2048 kb / s if we consider the 32 time intervals IT, but 1920 kb / s if we consider the 30 time slots used for the transport of the user data.
  • Each octet of an ATM cell is framed in a single IT time slot. There is no relationship between the beginning of a frame and the beginning of an ATM cell. This is because the number of bytes of an ATM cell is different from that of a circuit frame.
  • Fig. 2 represents an example of multiplexing ATM cells on a frame structure as just described.
  • the different frames are represented in stacks and numbered "frame n", “frame n + 1", etc. They succeed each other temporally in this order.
  • Each time interval is referenced by its rank and the byte number used for the corresponding data transmission. Only the time slots IT used are shown here (the byte numbers therefore vary from 1 to 30) and therefore not the rank time slots 0 and 16 which are used for other functions than data transport.
  • the ATM cells are packets of fixed length to 53 bytes, 5 of which are assigned to the header.
  • the bytes of non-empty ATM cells are therefore represented by a series of boxes each corresponding to a time interval in a frame.
  • the headers of these cells are grayed out.
  • Empty cells are not represented as boxes (they are not partitioned).
  • time slots IT are of rank in each frame comprised between 3 and 16, on the one hand, and 21 and 24, on the other hand.
  • Unused IT time slots are shown as non-partitioned.
  • the byte numbers used are here between 1 and 18.
  • a frame of type E1 / T1 is transparent to the contents of the cells.
  • the ATM cells are first extracted from the time frame, and then the AAL2 packets are extracted from the ATM cells for reassembly.
  • the AAL2 packets are inserted into ATM cells which are then inserted into the time frame and thus transmitted.
  • the disadvantage of this solution is that the ratio between the number of useful bytes and the number of bytes transmitted on the link is not favorable in terms of performance. Indeed, the 5 bytes of the ATM cell headers, to which are added a very variable number of stuffing bytes related to the multiplexing of the minicells, are as many IT time slots that can be considered as lost for the data. user.
  • WO-A-00/59261 and EP-A-874 530 provide solutions to this particular problem.
  • the first concerns a method for transporting minicells in a channel, for example of the E1 or T1 type, comprising a plurality of multiframes, each multiframe itself having several time slots. This process is such that the transport of these minicells no longer passes through the ATM layer. In other words, the header of the ATM cells is deleted and the minicells are directly transported in the E1 or T1 type frames. Nevertheless, this method requires inserting a start byte in the first time slot of each multiframe, said starting byte comprising a sequence number field (sequence number) serving to include the number of multiframes.
  • sequence number sequence number
  • EP-A-874 530 provides for the transmission of AAL2 mini-cells in T1-type frames. To do this, the ATM layer is eliminated. There, also a six-bit pointer is used to define the starting location of the next packet of the frame.
  • the purpose of the present invention is to propose a variable length packet transport method as just described but also any cells, such as ATM cells in a time circuit frame allowing to use with a maximum efficiency virtual circuit frame transmission medium, for example of type E1 / T1, which has a relatively low bandwidth (in this case 1,920 Mb / s).
  • a variable length packet transport method such as AAL2 packets and possibly cells such as ATM cells in time circuit frames such as E1 / T1 frames each cut into a plurality of frames. time intervals each occupied by one byte.
  • a transport method according to the invention is also of the type where the consecutive bytes of each variable-length packet and of each cell are in consecutive time intervals of at least one group of time slots of said frames, the first byte of a packet or cell being placed at a time interval pointed by a pointer occupying a specific time slot of said corresponding time slot group.
  • AAL2 packet means, data transport also to AAL2 packet means, ATM cell transport, information transport. control signaling using AAL5 packets contained in ATM cells, etc.
  • each pointer is associated with a virtual circuit address defining a virtual circuit for transporting said packet or said cell pointed by said pointer, as well as the packet or cells in the time slots of the frame belonging to the same group of time slots as said packet or said cell.
  • said pointer and said virtual circuit address consist of bits of the same byte.
  • said pointer occupies the first time interval of the group of corresponding time slots. Its value is advantageously the rank in the group of the first byte of the header of a packet minus one or, when the frame is partially empty and it does not contain a header or no full packet head, its value is the rank in the group of the first empty byte minus one. Moreover, its value is zero when the first byte of said packet or of said cell is in the time interval which follows directly that which is assigned to said pointer. Its value is equal to a specific value when the time intervals of the corresponding group are empty, a specific value which is for example equal to the number of time slots that each frame comprises.
  • the value of the pointer is equal to a specific value when all the time slots of the group are occupied by the bytes of a packet or a cell whose header is in the previous frame.
  • This specific value is for example equal to the number of time slots that each frame has minus one.
  • each frame may comprise several groups of time slots. But, it may comprise a single group of time slots either which occupies all the available time slots of each frame, or which occupies only partially the available time slots of each frame.
  • Said or each group may also be subdivided into non-consecutive subgroups of time slots.
  • the present invention also relates to end equipment of variable length packet transport links such as AAL2 packets and, optionally, cells such as ATM cells, by means of virtual circuit frames in accordance with a method of transport as just described.
  • said equipment is intended to process said packets in relation to cells identified by a virtual path identifier and a virtual circuit identifier.
  • the present invention comprises a correspondence table between the virtual circuit address of said packets and the virtual path and virtual circuit identifiers of said cells.
  • said equipment is a multiplexer / demultiplexer having, on the demultiplexed side, a plurality of ports for virtual circuit frame transport links and, on the multiplexed side, a port for ATM cell transport links.
  • it can also be a multiplexer / demultiplexer having, on the demultiplexed side, a plurality of bidirectional ports for virtual circuit frame transport links and, on the multiplexed side, a bidirectional port for circuit frame transport links. virtual.
  • this equipment comprises means for translating the connection addresses carried by the variable length packets so as to concentrate the traffic flows present on the multiplexed side ports.
  • the virtual path and virtual circuit identifiers are assigned according to the type of connection concerned.
  • the present invention also relates to time circuit frames each cut into a plurality of time slots each occupied by a byte which are characterized in that they are intended to carry packets at length.
  • variable such as AAL2 packets and possibly cells such as ATM cells according to a transport method as just discussed.
  • FIG. 4 there is shown an example of AAL2 packet multiplexing directly in the time slots IT of a time circuit frame, for example of the E1 / T1 type, according to the method of the present invention and this, using all the intervals IT time available in each frame (all time intervals except the rank intervals 0 and 16 otherwise used). These time intervals form between them what is called in the present description a group, especially a group of time slots used.
  • the three-byte header of each AAL2 packet is represented in gray, the other bytes being partitioned together. The empty bytes are not cloisonné.
  • AAL2 packets have the format shown in FIG. 1 and therefore, their header includes among others a CID connection identifier.
  • a specific time interval of each group of slots used in this case that of rank 1 of the group, is provided with a pointer PTR pointing to the time slot which contains the header of the first packet AAL2 contained in the group of time intervals used.
  • the value given to this pointer is for example the rank in the group of used intervals of the interval pointed to minus one.
  • the value of the corresponding PTR pointer has been indicated in the first time interval of each frame n to n + 9.
  • the first byte whose value is 2 points to the time slot that contains the first byte of the first AAL2 packet, ie the rank 3 time slot in the group of time slots used.
  • the first byte whose value is 13 points to the time slot that contains the first byte of the first AAL2 packet of the frame, ie the rank 14 time slot in the group of time intervals used.
  • the value of the pointer PTR is equal to the rank in the group of the first byte of a packet.
  • the PTR pointer points to the first empty byte (case of n + 3 and n + 5 frames) where the pointer value is respectively 15 and 19 to point the rank time slots 16 and 20 in the group of used time slots.
  • the general case applies so that the value of the pointer is equal to the rank in the group of the first byte of a packet ( case of the n + 9 frame where the value of the pointer is 2 to point the time interval of rank 3 in the group of used time intervals).
  • the value of the pointer takes on a significant value, in this case 31 (case of the n + 6 frame).
  • the first AAL2 packet that occurs after such a frame is framed on the byte that follows the byte containing the PTR pointer, so that the PTR pointer takes the null value (case of the n + 7 frame).
  • a null value indicates that the AAL2 packet contained in the frame has its first byte in the time slot immediately following the first time slot of the frame (case of the n + 4 frame).
  • a value equal to 30 means that the frame contains 29 bytes of a packet (all the time slots of the group of used time slots) having started in the previous frame (case of the n + 8 frame).
  • the frames can also be used for the transport of ATM cells.
  • the clocking principle on AAL2 packets is also implemented for ATM cells.
  • each group of time slots used may be subdivided into non-consecutive subgroups of time slots.
  • Subgroups can have different sizes.
  • FIG. 5 there is shown an example of AAL2 packet multiplexing directly in the time slots IT of a time circuit frame according to the method of the present invention and using only one group of subdivided time slots. into two subgroups SG1 and SG2 of time intervals IT.
  • the time intervals of the first subgroup SG1 are the rank time intervals of between 3 and 17, while the time intervals of the second subgroup SG2 are the rank time intervals of between 22 and 25.
  • the three byte header of each AAL2 packet is shown in gray.
  • all the bytes of each AAL2 packet are partitioned together, unused bytes for AAL2 packet or ATM cell transport are not.
  • the pointing principle is identical to that applied in FIG. 4. It can be seen that the PTR pointer is contained in the first octet of the time slot group assigned to AAL2 packet transport and ATM cells, in this case the first byte of subgroup SG1 preceding the first byte useful in the time interval of rank 4.
  • group of time intervals used the combination of subgroups SG1 and SG2.
  • the specific values assigned to this pointer they are the same as before.
  • the pointing principle is identical to that which was previously explained in relation to FIG. 4 except that the PTR pointer can not point unassigned time slots to the transport of AAL2 packets, such as rank time slots in frame 1 and 2, 18 to 21 and 26 to 31 .
  • FIG. 6 there is shown another example of AAL2 packet multiplexing directly in the time slots IT of a circuit frame which are assigned for this purpose.
  • two groups G1 and G2 of time slots are actually assigned for the transport of AAL2 packets.
  • These two groups G1 and G2 occupy all the available time slots of the frame, but this might not be.
  • these groups could also be subdivided into non-consecutive subgroups of time slots, like the subgroups SG1 and SG2 shown in FIG. 5.
  • the available intervals of the frame could be divided into more than two groups.
  • the first group G1 extends from the rank time slots in the frame 1 to 23, while the second group G2 extends from the rank 24 to 31 time slots in the frame.
  • the first time interval of each group is used for the pointer PTR1, PTR2.
  • Each group G1, G2 is independent.
  • the packet AAL2 of the first group G1 whose first byte is in the rank time interval in the frame equal to 4 (rank 3 of the group G1) of the frame n extends to the time interval of rank in the frame equal to 23 (rank 21 of the group G1) of the same frame n, then starts again at the time interval of rank 2 of the frame n + 1 (rank 1 of the group G1) to finish at the time slot of rank 21 of the same frame n + 1 (rank 19 of the group G1), as can be deduced from the value 19 of its pointer PTR1.
  • the packet AAL2 of the second group G2 whose first byte is in the time slot of rank 25 of the frame n + 1 (rank 1 of the group G2) extends to the rank 31 time interval of the same n + 1 frame (rank 7 of the G2 group), then starts again at the rank 25 time slot of the n + 2 frame, extends up to the rank time slot 31 of the same n + 2 frame, then starts again at the rank time slot 25 of the n + 3 and n + 4 frames, extends to the time of rank 31 of the same frames n + 3 and n + 4, then starts again at the time interval of rank 25 of the frame n + 5 to finish at the time interval of rank 27 of the same frame n + 5 (rank 3 of group G2), as can be deduced from the value 3 of its pointer.
  • a null value of the pointer PTR1, PTR2 indicates that the pointed AAL2 packet has its first byte in the time interval immediately following the first time interval of the group G1, G2.
  • a value equal to 30 means that the time intervals of the corresponding group G1, G2 contain the remaining bytes of a packet having started in the time slots of the same group of the previous frame.
  • the value 31 means that the time slots belonging to the corresponding group G1, G2 are empty.
  • the first AAL2 packet that comes after is framed on the byte that follows the byte containing the pointer PTR1, PTR2, so that the pointer PTR1, PTR2 takes the value zero.
  • the pointer PTR1, PTR2 points to the first empty byte.
  • the assignment of the time slots IT and the division into groups and subgroups of these time slots are for example carried out by the network manager in a semi-permanent manner. It is a network dimensioning operation that is not definitive, but can be modified according to various parameters, such as profiles or traffic natures.
  • the table below shows an example of a time slot assignment table IT in which the frame E1 is divided into 2 groups of independent time slots G1 and G2.
  • the crosses indicate the time slots that are reserved for the frame system.
  • the 1s indicate an assignment to the corresponding group. As for the 0's, they indicate that the time interval is not assigned to the corresponding group.
  • the group G1 contains the time intervals IT 3,4,5,6,7,8,9 and that the group G2 contains the time intervals IT 14 to 31, 16 excluded. As for time slots IT 1,2,10,11,12,13, they are not assigned to the transport of ATM traffic.
  • the value of the pointer PTR does not exceed the value 31, so that only 5 bits are sufficient to code it. If the PTR pointer is housed in a byte, there remain 3 bits that can be exploited to encode a VC VC address that is subsequently called AdVC address.
  • AdVC address The 0 value of the AdVC address is used to indicate that the frame is empty (contains no data) or that, in view of what has just been said, the pointer PTR points to an empty time slot.
  • the other 7 remaining AdVC address values (2 3 -1) are respectively assigned to particular virtual circuits. This address can also be used to differentiate two virtual circuits by the type of transport they allow, for example, a type of virtual circuit intended for the transport of voice to AAL2 packet means, a type of virtual circuit intended for the transport of voice.
  • data to AAL2 packet means, a type of virtual circuit ATM cell transport, etc. It could also address a signaling virtual circuit for transporting control signaling information by means of AAL5 packets contained in ATM cells.
  • AdVC address is associated with the AAL2 packet that is pointed by the PTR pointer. Therefore, all AAL2 packets that have headers in the same frame have the same AdVC address. They are therefore transported in the same VC virtual circuit.
  • FIG. 8 there is shown an example of AAL2 packet and ATM cell multiplexing in n + n + 14 virtual circuit frames using the same pointing principles as used in FIG. 4: There is only one group of time slots that is used for transport, this group consists of all available time slots of the frame and it is not subdivided into subgroups.
  • the value of the virtual circuit address AdVC has been reported next to the value of the pointer PTR. This AdVC virtual circuit address value is for example assigned to the virtual circuits in the manner that is set forth in the table below.
  • the packets (a), (c) and (d) are transported in the same virtual circuit whose AdVC address is equal to 1.
  • the packet (b) is the only one that is transported in the circuit virtual address of AdVC equal to 2.
  • the AAL2 (e) and (f) packets are transported in the same virtual circuit whose AdVC address is 3.
  • AdVC addresses concern empty time slots.
  • an AAL2 packet and an ATM cell may be multiplexed in the same frame provided that the first byte of their headers is not contained in the same frame.
  • ADVC VPI VCI Characteristics 1 0 200 VC AAL2 packet transport (voice) two 0 210 VC AAL2 packet transport (data) 3 0 50 VC AAL2 packet transport (voice) 4 0 60 VC AAL2 packet transport (data) 5 Unused 6 10 100 VC ATM cell transport (data on AAL5) 7 0 5 VC signaling
  • the table below shows another example of a translation table in the case where the transport is carried out in two groups of time slots G1 and G2 according to the principles described in relation with FIG. 6.
  • the time slot group G1 is allocated to transport AAL2 packets in 4 virtual circuits of AdVC addresses 1 to 4 and the transport of AAL5 packets in 3 AdVC 5 to 7 virtual circuits.
  • group G2 it is allocated to the transport of AAL2 packets in 2 virtual circuits of AdVC addresses 1 and 2 and to the transport of AAL5 packets in an AdVC virtual address circuit 7.
  • a multiplexing / demultiplexing circuit / ATM frame equipment thus comprising, on the demultiplexed side, bidirectional ports for time-division frame transport links and, on the multiplexed side, a port, also bidirectional, for an ATM cell transport link.
  • circuit / ATM frame multiplexing / demultiplexing equipment having, on the one hand, 5 bidirectional ports for transport links by time circuit frames (A, B, C, D and E) and, on the other hand, a port, also bi-directional, for an ATM cell transport link (M) and an example of a mapping table between the AdVC virtual circuit addresses and the VPI identifiers is given below.
  • VCI for each multiplex E1.
  • ADVC VPI VCI Connection type AT 1 10 100 AAL2 two 10 101 AAL2 7 10 5 AAL5 B 1 20 100 AAL2 two 20 101 AAL2 7 20 5 AAL5 VS 1 30 100 AAL2 two 30 101 AAL2 7 30 5 AAL5 D 7 40 5 AAL5 E 1 50 100 AAL2 7 50 5 AAL5
  • the table below is an example of a switch and translation table for AAL2 connections. It will be noted that the CID connection identifiers are necessarily translated. This table is updated during the establishment phases of AAL2 connections.
  • the concentrating equipment performs AAL2 packet switching functions and as such it must manage the AAL2 signaling protocol (IUT Recommendation Q.2630.2).
  • a multiplexing / demultiplexing equipment comprising, on the demultiplexed side, bi-directional ports for time-division frame transport links and, on the multiplexed side, a bidirectional port and for a transport link by frames of time circuits. More specifically and by way of example, we now consider a multiplexing / demultiplexing equipment comprising, on the multiplexed side, three ports (A, B, C) for transport links by virtual circuit frames supporting AAL2 traffic and, on the demultiplexed side. , a port E for a virtual circuit frame transport link.
  • Such equipment manages link ports for virtual circuit frame transport, but internally it processes AAL2 packet data units.
  • AdVC virtual circuit address translation table An example of an AdVC virtual circuit address translation table is given below.
  • Port of demultiplexed links ADVC Port of multiplexed links ADVC Connection type AT 1 E 1 AAL2 AT two E two AAL2 AT 7 E 7 AAL5 B 1 E 3 AAL2 B two E 4 AAL2 B 7 E 6 AAL5 VS 1 E 5 AAL2
  • each E1 frame contains only 29 useful bytes (30 bytes minus one byte of pointing).
  • cases 2 and 3 represent extreme configurations. The reality is to be placed between these two cases. Although the case of transporting AAL2 packets without empty IT time slots is a favorable case, it nevertheless remains more efficient than transporting AAL2 packets over ATM over E1 in high traffic situations.
  • the flow rate of 12.2 kb / s was chosen. It should be noted that the AMR coding provides for lower bit rates. The lengths of the corresponding packets are shorter. The incidence of stuffing bytes should therefore be greater in terms of lost yields. As an indication, the table below describes the length of the AAL2 packets for the different values of AMR coding rates.
  • the silences are the subject of the transmission of AAL2 packets of 13 bytes (5 + headers). Note the difference of 2 bytes between the rising and falling directions.
  • AMR coding rates (kb / s) Sizes of AAL2 packets on Iub up / down interface Sizes of AAL2 packets on UI uplink / downlink interface TTI 12.2 42/40 39/37 20ms 10.2 37/35 34/32 20ms 7.95 32/30 29/27 20ms 7.4 30/28 27/25 20ms 6.7 29/27 26/24 20ms 5.9 27/25 24/22 20ms 5.15 25/23 22/20 20ms 4.75 24/22 21/19 20ms Silence 13/11 10/8 80ms

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
EP02747502A 2001-06-12 2002-06-04 Procede de transport de paquets a longueur variable dans des trames de circuits temporels Expired - Lifetime EP1396123B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0107765A FR2825866B1 (fr) 2001-06-12 2001-06-12 Procede de transport de paquets a longueur variable dans des trames de circuits temporels
FR0107765 2001-06-12
PCT/FR2002/001901 WO2002101999A1 (fr) 2001-06-12 2002-06-04 Procede de transport de paquets a longueur variable dans des trames de circuits temporels

Publications (2)

Publication Number Publication Date
EP1396123A1 EP1396123A1 (fr) 2004-03-10
EP1396123B1 true EP1396123B1 (fr) 2006-10-04

Family

ID=8864286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02747502A Expired - Lifetime EP1396123B1 (fr) 2001-06-12 2002-06-04 Procede de transport de paquets a longueur variable dans des trames de circuits temporels

Country Status (9)

Country Link
US (1) US7733877B2 (ko)
EP (1) EP1396123B1 (ko)
JP (1) JP3774467B2 (ko)
KR (1) KR100903378B1 (ko)
AT (1) ATE341881T1 (ko)
DE (1) DE60215162T2 (ko)
ES (1) ES2274054T3 (ko)
FR (1) FR2825866B1 (ko)
WO (1) WO2002101999A1 (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7227852B2 (en) * 2001-09-21 2007-06-05 Sony Corporation Wireless transmission system, wireless transmission method, wireless reception method, transmitting apparatus and receiving apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5659544A (en) * 1994-10-17 1997-08-19 Lucent Technologies Inc. Method and system for distributed control in wireless cellular and personal communication systems
GB2316572B (en) * 1996-08-14 2000-12-20 Fujitsu Ltd Multicasting in switching apparatus
WO1998018246A2 (en) * 1996-10-22 1998-04-30 Philips Electronics N.V. Transmission system with flexible frame structure
KR100211918B1 (ko) * 1996-11-30 1999-08-02 김영환 비동기식전송모드셀 경계 식별장치
US6229821B1 (en) * 1997-04-22 2001-05-08 At&T Corp. Serial data transmission of variable length mini packets using statistical multiplexing
US6597697B1 (en) * 1999-02-09 2003-07-22 Telefonaktiebolaget Lm Ericsson Extended AAL2 connection identifier
US6600746B1 (en) * 1999-03-30 2003-07-29 Telefonaktiebolaget Lm Ericsson AAL2 framing on NX64 KBPS E1/T1
US6996109B2 (en) * 1999-12-27 2006-02-07 Lg Electronics Inc. ATM cell transmitting/receiving device of ATM switching system

Also Published As

Publication number Publication date
US7733877B2 (en) 2010-06-08
WO2002101999A1 (fr) 2002-12-19
EP1396123A1 (fr) 2004-03-10
JP2005520465A (ja) 2005-07-07
DE60215162T2 (de) 2007-10-25
KR20040019307A (ko) 2004-03-05
KR100903378B1 (ko) 2009-06-23
FR2825866B1 (fr) 2003-09-12
US20040240448A1 (en) 2004-12-02
JP3774467B2 (ja) 2006-05-17
ES2274054T3 (es) 2007-05-16
FR2825866A1 (fr) 2002-12-13
DE60215162D1 (de) 2006-11-16
ATE341881T1 (de) 2006-10-15

Similar Documents

Publication Publication Date Title
EP0690653B1 (en) Asynchronous transfer mode (ATM) transport of voice-band signals
US6075798A (en) Extended header for use in ATM adaptation layer type 2 packets
US5953339A (en) Logical link connection server
US6169738B1 (en) Method for call admission in packet voice system using statistical multiplexing and dynamic voice encoding
US6282196B1 (en) Dynamic build-out approach for use in packet voice systems
US6434151B1 (en) Communications system and method
US6052371A (en) System and method for the communication of operation and maintenance, administration and provisioning information over an asynchronous transfer mode network
JP3766693B2 (ja) 電気通信システム
JPH08214009A (ja) 広帯域セルのペイロード生成方法
US6714543B1 (en) ATM communications system and method
EP0934673B1 (en) Digital communications system
US6680937B1 (en) Telecommunications network architecture for transporting fax, voice and data via an ATM switch including a STM to ATM terminal adapter
CA2325910A1 (en) Accommodation frame and transmission device of different data traffics on common carrier wave
FI101921B (fi) ATM-virtuaalikanavien toteuttaminen pakettiverkossa
EP1396123B1 (fr) Procede de transport de paquets a longueur variable dans des trames de circuits temporels
US6795436B1 (en) Method to generate data cells, data cell generating arrangement, and data cell receiving arrangement
US6658008B1 (en) Method and apparatus for removal of dataless frames when transporting private line traffic over an ATM network
US20020126700A1 (en) Transmission techniques using universal data link protocol
US6870847B2 (en) Scheme for merging partially filled ATM cells
EP1274205B1 (fr) Unité de commutation d'un réseau de transmission par paquets
US7697424B2 (en) Method and device to transfer data in a communication network comprising a low-bit rate artery
US6694472B1 (en) Error correction for frames carried over multiple networks
WO2001047199A1 (en) Method and apparatus for transparent transmission between a tdm network and a packet or cell based network
FR2828782A1 (fr) Procede de routage de paquets a longueur variable, dits paquets de niveau aal2, transportes dans des cellules atm
Sherif Efficient transport of voice-band signals on ATM networks

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20031103

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20061004

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061004

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061004

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061004

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061004

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REF Corresponds to:

Ref document number: 60215162

Country of ref document: DE

Date of ref document: 20061116

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070104

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070104

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20070103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070316

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2274054

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070705

BERE Be: lapsed

Owner name: FRANCE TELECOM

Effective date: 20070630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070630

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20070105

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070630

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070604

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061004

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20140527

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20140529

Year of fee payment: 13

Ref country code: DE

Payment date: 20140523

Year of fee payment: 13

Ref country code: ES

Payment date: 20140617

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20140620

Year of fee payment: 13

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60215162

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150604

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20150604

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20160229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160101

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150604

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150630

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20160727

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150605